swiftui-treeview | ios-app-dev-memo

SwiftUI 汎用的TreeView

こんな感じのクラスが最小限と思う

swift

struct Node: Hashable {
 var name: String
 var children: [Node]?
 
 static func == (lhs: Self, rhs: Self) -> Bool {
  return lhs.name == rhs.name
 }
 func hash(into hasher: inout Hasher) {
  hasher.combine(name)
 }
 
 var isLeafNode: Bool {
  children == nil
 }
 var isParentNode: Bool {
  children != nil
 }
}

View側

swift

import SwiftUI

struct PrefListView: View {
 @EnvironmentObject var appData: ApplicationData
 
 @Binding var selectedAreaOrPref: Node?
 
 var body: some View {
  List(
   appData.areaToPrefNodes,
   id: \.self,
   children: \.children,
   selection: $selectedAreaOrPref
  ) { node in
   Text("\(node.name)")
  }
 }
}